EP0097363B1 - Rotary disk - Google Patents

Rotary disk Download PDF

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Publication number
EP0097363B1
EP0097363B1 EP83106044A EP83106044A EP0097363B1 EP 0097363 B1 EP0097363 B1 EP 0097363B1 EP 83106044 A EP83106044 A EP 83106044A EP 83106044 A EP83106044 A EP 83106044A EP 0097363 B1 EP0097363 B1 EP 0097363B1
Authority
EP
European Patent Office
Prior art keywords
hub
rotary disk
turntable
sheet
main spindle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
EP83106044A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0097363A1 (en
Inventor
Manabu Wakabayashi
Tohru Sampei
Hiroshi Kanai
Tomiyoshi Satoo
Yosuke Nagano
Takeo Sonobe
Isao Utsugi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Maxell Ltd
Original Assignee
Hitachi Ltd
Hitachi Maxell Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd, Hitachi Maxell Ltd filed Critical Hitachi Ltd
Publication of EP0097363A1 publication Critical patent/EP0097363A1/en
Application granted granted Critical
Publication of EP0097363B1 publication Critical patent/EP0097363B1/en
Expired legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B25/00—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus
    • G11B25/04—Apparatus characterised by the shape of record carrier employed but not specific to the method of recording or reproducing, e.g. dictating apparatus; Combinations of such apparatus using flat record carriers, e.g. disc, card
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G11B17/022—Positioning or locking of single discs
    • G11B17/028—Positioning or locking of single discs of discs rotating during transducing operation
    • G11B17/0284—Positioning or locking of single discs of discs rotating during transducing operation by clampers
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
    • G11B23/0014—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture record carriers not specifically of filamentary or web form
    • G11B23/0021—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture record carriers not specifically of filamentary or web form discs
    • G11B23/0028—Details
    • G11B23/0035—Details means incorporated in the disc, e.g. hub, to enable its guiding, loading or driving

Definitions

  • This invention relates to rotary disks in the form of sheets, and more particularly it is concerned with a rotary disk of compact size using a recording and reproducing sheet of small thickness.
  • a rotary disk of the type described is placed in a case formed with a window for a recording and reproducing head and provided with a shutter for opening and closing the window, and has thereon a multiplicity of recording tracks which are concentric.
  • Various kinds of information are written to and read out of the recording tracks by means of, for example, a magnetic head of a magnetic recording and reproducing apparatus through the window of the case.
  • the rotary disk is constructed such that, as disclosed in US-A-4,149,207, for example, the magnetic sheet itself is formed with an arrow-shaped opening for receiving a hub for connecting the rotary disk with a spindle of the turntable, and a receiving surface located outwardly of the opening and engaged with a drive pin of the turntable, the magnetic sheet and the hub being arranged such that their centers of rotation are in alignment with each other.
  • This type of rotary disk have the following features:
  • the invention has been developed for improvements on the above features of the prior art. Accordingly the invention has as one of its objects the provision of a rotary disk being simple in construction, which is free from the risk of the magnetic sheet being ruptured even if its thickness is small and which enables its center of rotation to be automatically brought into alignment with the center of rotation of the turntable as soon as the rotary disk is set on the turntable.
  • Another object is to provide a rotary disk which is free from the risk that the rotary disk might be displaced from the proper position on the turntable due to a disturbance that might act on the case and the turntable.
  • Figs. 1-4 show a rotary disk made on an experimental basis in accordance with the principle of the invention.
  • the rotary disk 1 comprises a flexible thin sheet 2, and a hub 3 of hard material secured to a central portion of the sheet 2.
  • the sheet 2 has an outer diameter of about 72 mm and a thickness of 77 11, and the hub 3 has an outer diameter of about 16 mm and a thickness of 4 mm.
  • the hub 3 is preferably formed of synthetic resinous material of high hardness and high wear resistance.
  • a turntable 4 for rotating the disk 1 is provided with a main spindle 5 located in the central portion, and a drive shaft 6 located outwardly of the main spindle 5.
  • the main spindle 5 and the drive shaft 6 are circular in cross section.
  • the hub 3 is formed with a center opening 7 for the main spindle 5 to be inserted therein, and a recess 9 formed on either side surface thereof and including a receiving surface 8 for receiving the drive shaft 6 engaged therewith.
  • the provision of the receiving surfaces 8 on opposite side surfaces of the hub 3 allows the rotary disk 1 to be supported on the turntable 4 on sither one of its two sides.
  • the center opening 7 is formed at its wall with at least two planar surfaces 10 and 10a which are located at a predetermined included angle 8 in the range between 60 and 120 degrees.
  • the center opening 7 is formed therein with a resilient member 11 for pressing the main spindle 5 of the turntable 4 against the two planar surfaces 10 and 10a.
  • the resilient member 11 exerts a pressing force on the main spindle 5 to a certain degree such that when the main spindle 5 of the turntable 4 is inserted in the center opening 7 of the rotary disk 1, the main spindle 5 is brought into light touch with the two planar surfaces 10 and 10a.
  • the resilient member 11 shown in Figs. 1-6 is in the form of a plate spring of metal having a thickness in the range between 0.1 and 0.3 mm. However, the invention as claimed does not include this specific form and the construction of the resilient member 11.
  • a pad 12 is arranged on a top surface of the sheet 2 and a magnetic head 13 is arranged on a bottom surface thereof as shown in Fig. 2.
  • the pad 12 and the magnetic head 13 are supported on a carriage 14 movable radially of the rotary disk 1.
  • FIGs. 5 and 6 show a modification of the rotary disk 1 shown in Fig. 1-4. Parts shown in Figs. 5 and 6 and being similar to those shown in Fig. 1-4 are designated by like reference characters.
  • a hub 15 of the rotary disk 1 shown in Figs. 5 and 6 is composed of a lower structural member 15a formed with a boss 15a1 and an upper structural member 15b formed with a hole 15b1 adapted to fit the boss 15a1 so that the lower and the upper structural members 15a and 15b of the hub 15 hold the sheet 2 and the resilient member 11 therebetween and secure the same in place.
  • the hub 15 is formed with a center opening 15c of octagonal shape which is chamfered as indicated at 15d.
  • the included angle 8 between the two planar surfaces 10 and 10a is set at a value over 60 degrees, the resistance that might occur when the rotary disk 1 comes out from the turntable 4 can be neglected. If the included angle 8 is below 120 degrees, the position in which the main spindle 5 is set against the two planar surfaces 10 and 10a is not readily varied by a disturbance that might occur.
  • the pressing force F1 and the frictional force F2 act in a manner to press the two planar surfaces 10 and 10a of the hub 3, 15 against the main spindle 5.
  • the main spindle 5 pushes back the hub 3, 15 with a force F3 representing the resultant of the pressing force F1 and the frictional force F2 as shown in Fig. 1.
  • the rotary disk 1 of the aforesaid construction can be readily provided by merely securing the hub 3, 15, which has the receiving surfaces 8, the two planar surfaces 10 and 10a and the resilient member 11, to the central portion of the sheet 2. Therefore the rotary disk 1 is very simple in construction, easy to fabricate and high in productivity.
  • Figs. 7-15 ' show the rotary disk according to the invention produced on a mass production basis for practical use. More specifically, as shown in Figs. 7 and 8, a rotary disk 16 is put to use while being held in a case 17 composed of an upper case member 17a and a lower case member 17b.
  • the case 17 is formed at each of its top and bottom surfaces with a center aperture 18 for receiving a collet or a disk holding table as subsequently to be described, a magnetic head receiving opening 19 and an indexing aperture 20.
  • the case 17 may have a liner attached to its inner surface so as to clean the disk.
  • the rotary disk 16 comprises a magnetic sheet 16a of disk-shape having a circular opening 16b in the center, and a hub 21 for holding a peripheral edge portion of the circular opening 16b.
  • the hub 21 is composed of an upper structural member 22 and a lower structural member 23 both formed of allyl resin.
  • the hub 21 is formed with a center opening 27 for receiving a main spindle 26 connected to a top surface of a turntable 25 of disk driving means 24 subsequently to be described, and at least one receiving surface 29 for receiving a drive shaft 28 of the turntable 25.
  • the receiving surface 29 may be provided at either one or both of top and bottom surfaces of the hub 21 by forming a guide groove 30 of an arcuate shape and providing a projection 31 which define two ends of the arcuate groove 30.
  • the disk driving means 24 comprises the turntable 25 and a collet 32 facing the turntable 25.
  • the turntable 25 has the main spindle 26 extending from the center of the top surface of the turntable 25, and the drive shaft 28 located outwardly of the main spindle 26 on the top surface of the turntable 25.
  • the upper structural member 22 and the lower structural member 23 of the hub 21 are formed on surfaces thereof which face each other in positions biased toward outer peripheries with sheet holding annular surfaces 33 and 34 projecting from the respective surfaces and located concentrically with the center opening 27 of the hub 21.
  • FIG. 13 four welding pins 35 of a greater height and four sheet positioning pins 36 of a smaller height are alternately arranged on the top surface of the lower structural member 23 of the hub 21 in positions located inwardly of the sheet holding surface 34 toward the center opening 27.
  • the upper structural member 22 of the hub 21 is formed with apertures 37 for receiving the welding pins 35 therein.
  • the sheet 16a In assembling the sheet 16a with the hub 21, the sheet 16a is placed on the top surface of the lower structural member 23 of the hub 21 and the peripheral edge of the circular opening 16b of the sheet 16a is brought into contact with the position pins 36, to thereby obtain positioning of the sheet 16a with respect to the hub 21. Then the upper structural member 22 of the hub 21 is placed on the sheet 16a to insert the welding pins 35 of the lower structural member 23 of the hub 21 into the apertures 37 formed in the upper structural member 22 thereof. Thereafter upper ends of the welding pins 35 projecting upwardly from the apertures 37 into the guide groove 30 of the upper structural member 22 are melted by ultrasonic waves to weld the upper and lower structural members 22 and 23 into a unitary structure to provide the hub 21 assembled with the sheet 16a.
  • a gap g (see Figs. 10 and 11) is defined between the upper and the lower structural members 22 and 23 of the hub 21 in portions thereof located toward the outer peripheries from the sheet holding surfaces 33 and 34.
  • a relief hole 23a for defining the center opening of the hub 21 having a projecting wall portion 38 in the relief hole 23.
  • the projecting wall portion 38 is formed on its inner surface with two planar surfaces 39 and 39a forming an included angle of about 90 degrees which are to be in point contact with the main spindle 26 at two points P1 and P2 (see Fig. 9) and symmetrical with respect to the line of radius extending through the center of the hub 21.
  • a cantilever-type resilient member 40 Projecting from the projecting wall portion 38 is a cantilever-type resilient member 40 which is bent in the form of an arc having a center of its curvature at the center of the hub 21.
  • the resilient member 40 is formed at its free end with a head 40a which, located in face-to-face relation to the two planar surfaces 39 and 39a, is in point contact with an outer periphery of the main spindle 26 at a point P3, to thereby lightly press the main spindle 26 against the two planar surfaces 39 and 39a.
  • the upper structural member 22 is formed with a relief hole 22a for receiving the projectiong wall portion 38 of the lower structural member 23, and a segmental boss 41 being to be received in the relief hole 23a of the lower structural member 23.
  • the segmental boss 41 includes an inner wall surface 30a (see Fig. 9) constituting an inner wall of the guide groove 30 appearing on the bottom surface of the hub 21, two projecting walls 42 and 43 defining a part of the center opening 27 and extending from the inner wall surface 30a toward the center of the hub 21, and a recess 44 defined between the two projecting walls 42 and 43 and extending vertically.
  • the resilient member 40 When the upper and the lower structural members 22 and 23 are engaged together into a unitary structure, the resilient member 40 has its intermediate arm inserted from below into a recess 42a (see Fig. 11) formed at the projecting wall 42 and its head 40a inserted in the recess 44.
  • the head 40a has an inner end surface which is nearer to the center of the center opening 27 than the inner end surfaces of the two projecting walls 42 and 43.
  • An annular projection 45 defining a radiaily outer surface of the guide groove 30 on either surface of the hub 21 is formed with three outer reference surfaces 46 for the turntable 25.
  • the projecting wall portion 38 and the segmental boss 41 defining an innerwall of the guide groove 30 are formed with a plurality of inner reference surfaces 47 for the collet 32.
  • the inner reference surfaces 47 are smaller in height than the outer reference surfaces 46.
  • the force with which the two planar surfaces 39 and 39a are pressed against the main spindle 26 is obtained from the pressing forces applied by the drive shaft 28 and the resilient member 40. Because of this, the pressing force applied by the resilient member 40 may be such that when the rotary disk 16 is set on the turntable 25, the planar surfaces 39 and 39a of the hub 21 are lightly contact with the main spindle 26.
  • the lower structural member 23 of the hub 21 is formed integrally with the resilient member 40, so that this construction has improved productivity as compared with the construction shown in Fig. 1-6 in which a plate spring is used as a resilient member.

Landscapes

  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)
EP83106044A 1982-06-21 1983-06-21 Rotary disk Expired EP0097363B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP57107184A JPS58224479A (ja) 1982-06-21 1982-06-21 回転ディスク
JP107184/82 1982-06-21

Publications (2)

Publication Number Publication Date
EP0097363A1 EP0097363A1 (en) 1984-01-04
EP0097363B1 true EP0097363B1 (en) 1987-12-09

Family

ID=14452594

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83106044A Expired EP0097363B1 (en) 1982-06-21 1983-06-21 Rotary disk

Country Status (6)

Country Link
US (1) US4796140A (enrdf_load_stackoverflow)
EP (1) EP0097363B1 (enrdf_load_stackoverflow)
JP (1) JPS58224479A (enrdf_load_stackoverflow)
KR (1) KR880002573B1 (enrdf_load_stackoverflow)
AU (1) AU538982B2 (enrdf_load_stackoverflow)
CA (1) CA1197008A (enrdf_load_stackoverflow)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3378389D1 (en) * 1982-08-05 1988-12-08 Hitachi Maxell Recording disc cartridge
US4568988A (en) * 1984-02-22 1986-02-04 Rodime Plc Micro hard-disk drive system
US4638383A (en) * 1984-02-22 1987-01-20 Mcginlay James G Micro hard-disk drive system
JPS60163560U (ja) * 1984-04-05 1985-10-30 ソニー株式会社 磁気記録媒体
JPS627654U (enrdf_load_stackoverflow) * 1985-06-26 1987-01-17
JPH0743866B2 (ja) * 1985-10-24 1995-05-15 キヤノン株式会社 デイスク駆動装置
JPS6298041U (enrdf_load_stackoverflow) * 1985-12-06 1987-06-22
NL8503563A (nl) * 1985-12-24 1987-07-16 Nagron Precision Tooling Schijfvormige informatiedrager met van een centraal gat voorzien inzetstuk.
JP2508066Y2 (ja) * 1989-04-06 1996-08-21 富士写真フイルム株式会社 磁気ディスクカ―トリッジ
US5060106A (en) * 1989-11-13 1991-10-22 Laser Magnetic Storage International Company Disk cartridge including door opening mechanism and improved hub assembly
JPH0616332B2 (ja) * 1990-03-02 1994-03-02 ソニー株式会社 可撓性磁気ディスク
US5212614A (en) * 1991-02-05 1993-05-18 Hoechst Celanese Corporation Flexible magnetic disc cassettes with separable cassette cases
US5164871A (en) * 1991-02-05 1992-11-17 Hoechst Celanese Corporation Shutters with integrally molded spring elements for flexible magnetic disc cassettes
US5200871A (en) * 1991-02-05 1993-04-06 Hoechst Celanese Corporation Flexible magnetic disc cassettes with integrally molded drag fingers
US5177656A (en) * 1991-02-05 1993-01-05 Hoechst Celanese Corporation Flexible magnetic disc cassettes with integrally molded wear button
US5214555A (en) * 1991-04-12 1993-05-25 Hoechst Celanese Corporation Central hubs for flexible magnetic data discs formed of magnetically soft polyacetal compositions
JP3278701B2 (ja) * 1991-06-24 2002-04-30 セイコーエプソン株式会社 ディスク装置
US5648881A (en) * 1991-06-24 1997-07-15 Seiko Epson Corporation Disk driving motor and chucking mechanism for disk drive apparatus
US5581423A (en) * 1991-06-24 1996-12-03 Seiko Epson Corporation Disk driving motor and chcuking mechanism for disk drive apparatus
USRE37791E1 (en) * 1991-06-24 2002-07-16 Seiko Epson Corporation Disk driving motor and chucking mechanism for disk drive apparatus
US5486962A (en) * 1994-10-12 1996-01-23 International Business Machines Corporation Integral hub and disk clamp for a disk drive storage device
US6160680A (en) * 1997-08-29 2000-12-12 Iomega Corporation Two-piece media hub and methods of attaching same to a medium
KR100745819B1 (ko) * 2001-04-19 2007-08-02 엘지전자 주식회사 디스크 드라이브의 턴테이블장치
US20070263316A1 (en) * 2006-05-11 2007-11-15 Dickson/Unigage, Inc. Method And Apparatus For Supporting And Orienting A Workpiece And A Workpiece For Use Therewith

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4152740A (en) * 1977-03-16 1979-05-01 Arvin Industries, Inc. Magnetic disc recorder and cassette
US4149207A (en) * 1977-10-25 1979-04-10 International Business Machines Corporation Cartridge and flexible magnetic disk assembly
US4166622A (en) * 1978-02-13 1979-09-04 Rager Edgar A Centering collar for a disk hub
JPS606938Y2 (ja) * 1980-08-14 1985-03-07 ソニー株式会社 記録再生用デイスクカセツト
JPS6138145Y2 (enrdf_load_stackoverflow) * 1980-08-14 1986-11-04
US4532564A (en) * 1981-09-16 1985-07-30 Dysan Corporation Removable disk cartridge
US4459628A (en) * 1982-04-19 1984-07-10 Cipher Data Products, Inc. Disk cartridge
JPS58169222U (ja) * 1982-05-08 1983-11-11 ソニー株式会社 回転板軸受
US4503530A (en) * 1982-05-27 1985-03-05 Digital Equipment Corporation Disk hub spindle system

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
IBM Technical Discl. Bulletin Vol. 13, No. 5, Oct. 1970, p. 1242 *

Also Published As

Publication number Publication date
CA1197008A (en) 1985-11-19
AU1593083A (en) 1984-01-05
JPS58224479A (ja) 1983-12-26
US4796140A (en) 1989-01-03
EP0097363A1 (en) 1984-01-04
KR880002573B1 (ko) 1988-11-30
AU538982B2 (en) 1984-09-06
KR840005260A (ko) 1984-11-05
JPH0435825B2 (enrdf_load_stackoverflow) 1992-06-12

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